Estimation and application of end-to-end delay under unsaturation traffic in wireless ad hoc networks

In this paper, we analysis the average packet delay on IEEE 802.11 DCF under unsaturation traffic in multi-hop ad hoc networks. We employ a Markov chain model to analysis the probability of transmission at each node in an arbitrary slot, and derive the channel access delay. We model each node using an M/G/1 queue and derive the queueing delay. The model is extended from analyzing the single-hop average packet delay to evaluating the end-to-end packet delay in multi-hop ad hoc networks without assuming the traffic to be in a saturation state. We have done extensive simulation to validate our analysis. The analytic and the simulation results match very well. The analysis results can be used to evaluate the fairness level of wireless channel